Mold for casting a brake head



Feb. 18, 1941.

F. M. HEss MOLD FOR CASTING A BRAKE HEAD Filed 001'.. 16, 1939 2 Sheets-Sheet l INVENTOR FRANC/s M. Hass @AJM TTORNEY Feb. 18,V 1941. F M HEss 2,232,526

MOLD Fon CASTING A BRAKE HEAD Filed oct. 16, i959 2' sheetssheet 2 33 2633 (28mm/2r,

. Ir ,l l 'I'. Q

'SL29 f 2g IN VEN TOR ATTORNEY Patented Feb. 18, 1941 sv PATENT oFI-lcE `Railway Equipment Company, Chicago, Ill., a

corporation of Illinois y UNITED STATE It is common practice to use a cast brake head Figure 9 is a detail transverse section taken 512'? cored to receive one end of a compression memon the line 9 9 of Figure 8. ber and vto accommodate the passage there- The truss type brake beam illustrated in Figthrough of a tension rod having its end threaded ure 1 comprises a compression member 2, a tenfora tensioning nut which seats against an exsion rod 3, a strut 4, a pair of brake heads 5,

10 ternal face of the brake head and may be tightseated on the ends of member 2, and nuts 6 10J ened to draw the parts together. threaded on the ends of rod 3 and seated against j In casting brake heads of this type, difficulty the outer faces of the compression member and is encountered in consistently placing the core holding the parts together and determining the Y accurately in the mold. The axis of the tension initial tension on rod 3 and the camber of mem- 'rod should be at the correct angle to the exber 2. `151i` ternal face of the head forfully seating the nut. Each brake head 5 is arranged to carry the Any disalignmentf necessitates drilling and facing usual brake shoe (not shown) and has a socket the casting; otherwise the useful life of the brake portion I I which receives the end of compression head and tension rod will be unduly limited. member 2 and includes a bearing surface `I2 s One object of the `invention is to insure a head l for the tension rod and also includes an exteriorzos. casting in which the external face seating the surface I3 at right angles to the axis of surface tensioningfnut will be atr right angles to the axis I2 and on which tensionnut E seats. of the passage for the tension rod. In general practice socket portion I I is formed Another object of the invention is to provide by a baked sand core I 4 which ispositioned by a fixed angular relation between the tension nut core prints I5` and I6 which taper outwardly 25 receiving face and all internal surfaces of the and support the core from their seats in the brake head. green sand S of the mold,v `The green sand mold Another object of the invention is to provide or matrix forms the exterior surfaces of the for casting a brake head with a rod receiving brake head and the baked sand core I4 forms elongated sleeve indesired angular relation to the interior Vsurfaces and when a head is cast 30,

the nut seating face. with the core placed correctly in the mold and Another object is to eliminate machine finisha tension rod is placed against surface I2, the ing of the brake head even though the core was rod center line, as indicated at I1, willu be at disaligned in the mold prior to the pouring of right angle tothe head exterior surface I3 and 'the metal or was oated out of correct position the rod nut 6 will then fully seat as indicated 35 by the fluid metal. by the'dotted line I8 in FigureS.

These and other objects will appear in the In the hurry of production, moldersare somespeclcations and` from reference to the drawtimes careless and place the core `in a disaligned ings in whichl, position relative to the pattern print, as'illus- 40` f Figure 1 is a top` view of a truss type brake trated in Figure 4, and this will shift al1 interior 4'0 beam with one end portion sectioned horizonsurfaces, including the tension rod bearing I2, tally. relative to the exterior surfaces, and when the Figure 2 is a vertical transverse section taken head is assembled with the other beam parts, on the line 2-2 of Figure 1. the nut will seat against the surface I3 at only 5 Figure3 is a section. through a portion of a one point, as indicated by dotted line I9 in Fig- 5, mold and a core therein placed correctly to proure 4. A burr, indicated at 20, may be formed duce `an accurateI head casting which is `also by the tapered core print I6 shifting into the shown sectioned as it appears in Figure 1, but pattern print. This would prevent a full contact on aV larger scale. f ofthe rod with the bearing I2.

Figure 4 is a similar section but showing the Before such a misformed casting can be used,

head as produced when the core was shifted the'burr 20 must be removed and the surface50 from its lcorrect position before the metal was I3 must be faced so that nut 6 will fully seat poured. and the tension rod will contact the full length Figures 3 and 4 illustrate well-known mold, of surface I2.

gcore, and casting arrangements. Figures 5 and 6 illustrate an arrangement *of Figure 5 is a section corresponding generally mold and core whereby all interior surfaces of 55 to that shown in Figure 3 but embodying a core the head will be in fixed relation to the surface and mold arrangement embodying a form of the seating the tensioning nut. Core 26 is providedy present invention. with an enlarged core print 21 to rest in the Figure 6 is a section corresponding to that green Sand t0 Support the core and having an shown in Figure 5 but in which the core has been 60 l Application October 16, 1939, Serial No. 299,601

6 Claims.

The invention relates to the production of railway brake beams and more particularly to the casting of brake heads associated with truss type beams.

shifted from its normal or correct position in the mold.

Figures 7 and 8 correspond to Figure 5 but illustrate other forms of the invention.

annular face 21a spaced from the core shoulder 28 and forming the portion of the mold which produces the nut seat 29 on the head. The rod bearing forming side 30 of the core extends sufficiently to form aportion of the core print 3| so that no burrs are formed if the core is disaligned in the mold.

Forming the exterior nut seating surface 29 by the core eliminates the expensive operation of drilling and facing the casting to obtain the desired angle between the tension rod bearing 32 and the nut bearing surface 29. Also surfaces 33 that position the compression member are in fixed relation to the surface 29 irrespective of the position Core 26 assumes in the mold.

Another arrangement is illustrated in Figure 7 in which a short tension rod receiving sleeve 3d in the head 35 is formed by the core 36. The core print 3l forms the external tension nut seat in fixed relation to the center line 38 of the sleeve 34. .Core prints 39 and 40 are of such length that burrs will not be formed on the casting sleeve is formed in the head by the oneing if the core print is shifted in the pattern print.

Another arrangement is illustrated in Figures Band 9 in which a full length tension rod receivpiece core '47. The sleeve-coring portion i3 is supported by the ribs 69 which form slots in the sleeve, but do not affect the efliciency of the sleeve. The enlarged core print 5E! forms the tension nut bearing face 5l in fixed relation to the center line 52 of sleeve 45.

`In' all forms of the invention illustrated, one exterior nut-bearing surface is formed by the `-core and accordingly is in fixed angular relation lto all interior surfaces of the brake head socket portion irrespective of the core shifting relative to the pattern print. The advantage of this relation is particularly marked in the arrangements shown in Figures '7 and 8 in which the heads include sleeves for surrounding the rod.

While the structures described are particularly adaptable for casting railway brake heads which have bearings for the side of the rod at points spaced from the nut, it is to be understood that the correct positioning of the nut seat is not dependent upon this eature and variations in the head other than the one shown may be made by those skilled in the art without departing from the spirit of the invention, and the exclusive use 'of such modications as come within the scope of the claims is contemplated.

What is claimed is:

1. In a mold for a railway brake head, a green sand matrix including a core supporting print and a ysurface for shaping the exterior of the casting, and a one piece core of baked sand having a print supported in said matrix print, said core print including a portion forming an extension of said matrix surface for shaping the exterior of the casting part which seats the tension rod nut, said core having a portion for shaping an interior surface of the casting which seats the side of the tension rod.

2. A core for a railway brake head forming mold, comprising a body part for shaping the interior of the brake head and providing therevon a surface forming a bearing for the side of a tension rod, and a print projecting from said body part to support the core in the mold and having a portion facing toward said body part for threaded on the rod whereby said bearing and said seat will be cast in a predetermined relation to each other irrespective of Variation in the mold matrix or variation in the relative position of the core in the mold matrix.

3. A one-piece rigid core for use in casting a railway brake beam head and comprising a cylindrical portion arranged to form the inner wall of a cylindrical sleeve extending inwardly from the side wall of the head, for receiving a brake beam tension rod, and a flat annular portion extending transversely of the axis of said cylindrical portion and arranged to form an outwardly facing seat for a nut threaded on a beam ltension rod inserted through said sleeve.

4. In a mold for casting a railway brake head having a cylindrical sleeve extending inwardly from one side thereof, a green sand matrix` including a core supporting print and a surface for shaping the exterior of the casting, and a onepiece core of baked sand having a print supported in said matrix print, said core print including a portion forming an extension of said matrix surface for shaping the exterior of the casting part which is adapted to seat a tension rod nut, said core having a cylindrical portion arranged to form the inner wall of the head cylindrical sleeve, said nut seat formingI portion being disposed at right angles to the axis of said cylindrical portion whereby the relation between the nut seat and the rod receiving portion of the cast head will be determined irrespective of variation in the mold matrix or variation in the relative position of the core in the mold matrix.

5. A one-piece rigid core for use in castingva railway brake beam head having a sleeve extending between its side walls, comprising spaced body portions shaped to form inner walls of the head, a cylindrical portion intermediate said body portions and arranged to form the inner wall of a cylindrical sleeve extending from side to side of the head, there being ribs of restricted'cross sectional area between said cylindrical portion and said body portions, and a flat annular portionV extending from said cylindrical portion transversely of the axis of the latter to form an outwardly facing seat for a nut threaded on a beam tension rod extending through said sleeve, whereby the angle between said nut seat and the rod extending through said sleeve may be predetermined irrespective of variation in the mold matrix or of the position of the core in the mold matrix.

6. In a mold for a railway brake head having a cylindrical sleeve extending from one side to the other, a green sand matrix including a core supporting print at one side and a surface for shaping the exterior of the casting, and a onepiece core of baked sand having a print supported in said matrix print and including a portion forming an extension of said matrix surface for shaping the exterior of the Casting part toA seat a beam tension rodnut, said core having a cylindrical portion extending to the opposite side of said matrix and arranged to form the inner wall of a cylindrical sleeve in the casting, whereby the relation between said seat and the axis of a rod extending through said sleeve may be pre-A determinedl irrespective of variation in the mold matrix or variation in the position of the core in said matrix. v

FRANCIS M. HESS. 

